diff --git a/Serializer.php b/Serializer.php
index c7156f3a5..835271a80 100644
--- a/Serializer.php
+++ b/Serializer.php
@@ -69,7 +69,7 @@ public final function serialize($data, $format)
         $encoder = $this->getEncoder($format);
 
         if (!$encoder instanceof NormalizationAwareInterface) {
-            $data = $this->normalize($data);
+            $data = $this->normalize($data, $format);
         }
 
         return $this->encode($data, $format);